Steam-boiler



(No Model.) 2 Sheets- Sheet 1. M. 8v W. N. RUMELY.

STBAMYBOILER. l

PatentNed Novw, 1885. w

,I l Wx (No Model.) 2 Sheets-Sheet 2.

M. & W. N. RUMELY. STEAM BOMBE.

N0. 329,489. Patented Nov. 3, 1885.

juf/WM @y web2/,w www@ N. percus mowufrwgmpmr. washmgm. n. c.

llNiTnn STATES PATENT @risica MEINRAD RUMELY AND VILLIAM N. RUMELY, OF LA PORTE, INDlANA.

STEAM-BOILER.

FECIEICATON forming part of Letters Patent No. 329,489, dated November 3.1885.

Application led May 22, 1885.

L7" 0 all whom t may concern.-

Beit known that we,MEINRL\D RUMELY and VILLIAM N. RUMELY, citizens of the United States, :residing in La Porte, in the county of La Porte and State of Indiana, have invented a new and useful Improvement in Steam-Boilers, of which the following is a specification.

This invention relates more particularly to steam-boilers which are adapted or designed for burning either straw or coal as a fuel, and which are commonly used for driving thrashing-machines, and for other agricultural purposes.

The object of the invention is to adapt by simple, cheap, and practical means an ordinary Cornish or return-flne boiler, so that it will efficiently and economically burn either light fuels, like straw, or the denser fuels, like coal or wood, and also to increase both the durability and heating or steam-generating power of such boilers, as they have heretofore usually been constructed.

ln our invention, in order to keep a bed of ijre or coals over the grate in burning straw, so as to always quickly ignite the fresh fuel when it is fed in, and to prevent the fresh straw as it is pushed in along the main or tire flue from shoving these light coals ahead of it, as well as to prevent the draft along the main iiue from carrying such coals away, and thus putting the fire practically out when it happens to get a little low, we depress the grate below the surface of the main flue, so that the fresh straw, as it is pushed in, may slide or rest on the walls ofthe main due surrounding the grate, and thus pass over the bed of light coals on the grate into position to be ignited thereby without disturbing said coals. The bed of coals is also thus protected from the direct draft from the feed door or chute along the main or fire fine. To bette'r accomplish these results, as well as to economize space and give agreater depth to the tireflue above the center of the grate, we make the grate curved in cross-section, the curve being preferably concentric with the fire or main tlue. The grate is made, preferably, in two pieces, and the openings through the same should be simply round holes, in order to properly support the coals of straw fuel.

To increase the heating and steam-generat- Serial No. 166,363. (No model.)

ing power of the boiler, a flat crown-sheet is extended from the flue-sheet back to the rear end of the boiler above the combustion-chamber and below the water-line, so as to utilize in generating steam this hottest part of the boiler,where the ignited gases and products of combustion curve upward from the main or tire flue to enter the returirflues. In this way or by this means we also greatly increase the durability ofthe upper wall of the combustionehamber, which in this class of boilers has heretofore usually burned out very quickly, owing to the great heat to which it is subjected. As this construction necessarily somewhat contracts the depth of the combustion-chamber, we compensate therefor by increasing its length slightly. A fire-arch projects from the end of the main er lire flue inthe combustion-chamber to cause the ignited gases to be curved and deliected up against this crownsheet, and to be carried back nearer the rear end of the combustion -chamber. This rearch is of especial service in connection or combination with the lengthened combustionchamber.

A further or additional improvement consists, in connection with the features of our invention before mentioned, in providing awater leg or jacket at the end of the combustionchamber, and also in making the main flue tapering toward the combustiou-ehamber, so as to give more room for the return-dues toward the rear end of the boiler, while the size of the main flue above the grate is preserved the same in order to properly utilize the flashdame.

In the accompanying drawings, which form a part of this specification, and in which similar letters of reference indicate like parts, Figure l is a central longitudinal section of a boiler embodying our invention. Figs. 2, 3,

and 4 are cross-sections of Fig. l on lines 2 2,

3 3, and 4 4, respectively. Fig. 5 is a front end View, and Fig. 6 is a partial longitudinal section showing certain additional or further improvements not shown in Fig. l.

In said drawings, A is the shell of the boiler; A', its front head, and A2 its rear head.

B is the main or fire flue extending from the front head to the combustion-chamber C at the rear end of the boiler. rihe return-fines IOO ber, which is made somewhat longer than is usual, and up against the crown-sheet C'.

G is a door or opening at the rear end of the combustion -chamber, through which access may be had for cleaning out the dues, making repairs,`&c. In Fig. 6 this opening is shown of smaller size, and a water leg or space, g, is

formed at the end of the combustion-chamber by inserting a ring or frame, g', to which the head A2 and the end sheet, g2, of the combustion-chamber are secured or riveted. This water-space g at the end of the combustionchamber gives additional heating-surface. In Fig. 6 also we have shown the main fiue B as made tapering from the front end of the boiler toward the combustion-chamber, so as to give increased space for the return-dues D at that end of the boiler.

H is the grate. It is preferably made in two pieces, divided longitudinally, and curved in cross-section concentrically with the fire-Hue B. The grate rests in a recess or opening, H',

. through the fire-flue shell B and boiler-shell A, and it is supported upon the sheet or wall 7L, which unites the boiler-shell and main-due shell. rlhe depth of this recess H' is considerably greater than the vertical thickness of the grate, so that the uppersurface of the grate is depressed below the inner wall or shell of the main flue in order to form a protected space over the grate for the light straw coals, out of the line of the direct draft along the main due from the feed-door. The walls of the main flue around the depressed grate also serve to prevent the fresh straw as it is pushed into the furnace from disturbing the light coals upon lthe grate. It will be observed that the water-space a between the main Hue and boiler extends in front of the grate, and that the smoke-box E also entirely surrounds the main flue B. The grate H is provided with holes h'.

K is a chute or funnel through which the straw is fed into the boiler or furnace. The inner end, k, of this funnel is out off `diagonally and provided with a hinged door, lc', which closes by its own gravity, but readily opens when fuel is being pushed through the funnel. The hinge k2 of this door, it will be seen, is at the upper side of the funnel. The funnel is secured to the head A', so that it can be readily and quickly removed by means of a collar, 7c3, rigidly secured to the funnel, and provided with forked lugs k, which fit over the bolt-heads lr5 on the head A', and by a key, k, which passes through a staple or slotted bolt, k7, on the head A', that projects through a slot or hole in the collar 7c3.

L is the door, which closes the opening in the head A' when the funnel is removed. It is hinged to the head A', and when notin use is simply swung back out of the way, as shown in Fig. 5.

M is a door opening into the smoke-box to give access to the return-dues D for cleaning, repairing, &c.

Nrepresents the steam-dome; P. the smokestack, and O the ash-pan. The bottom wall of the combustion-chamber C is slightly elevated at its rear end or inclined upward, as shown in Figs. l and 6, to give room for a hand-hole at the end of the boiler into the annular space between the shell and the oombustion-chamber. This upward inclination of the bottom sheet or wall Aof the combustionchamber also increases the .heating-power of the boiler, as the flame will by this means be projected more effectually against said bottom wall.

We claiml. The combination, in a Cornish or returnflue boiler, of shell A with main flue B, eX- tending from the front head of the boiler to the combustion-chamber, and having a strawfeed chute and door` or opening at its front end, and a grate, H, the upper surface of which is depressed below the interior wall of said main flue, substantially as specified.

21 The combination, in a return-flue boiler, with shell A, of main flue B, provided with a recess or opening, H', between said main flue and shell, and a grate, H, supported on aprojecting edge of said shell A, surrounding said opening H', and said grate having its Lipper surface depressed below the interior wall of said main iiue, substantially as specified.

v 3. Theycombinatiou of Shen A, nrt--nue B, grate H, depressed below the surface of said Iire-iue, and straw-feed chute K at the front end ofsaid iiue B, substantially as specified.

4. The combination of shell A with re or main flue B, combustion-chamber C, returnilues D, and curved grate H, depressed below the surface of said fire-fine, substantially as specified.

5. The combination, in a return-flue boiler, of the fire-fine B with a curved grate, H, divided longitudinally into two parts, substanstantially as specified.

6. The combination, in a return-due boiler, of shell A, tire-flue B, straw-feed chute K, and a grate, H, depressed below the surface of said fire-fine, and provided with holes h, substantially as specified.

7. The combination of shell A, tire-flue B, return-fines D, combustion-chamber C, having crown-sheet C' over the same extending below the water-line of the boiler, and tire-arch F, projecting froin the rear end of said main line into said combustion-chamber, substantially as specified. y

8. The combination of shell A with fire-flue B, combustion-chamber C, having crown-sheet IOO IIO

C, and an annular or continuous waterspace surrounding said chamber between the same and said shell A, return-fines D, and grate H, depressed below the interior surface of said main flue B, substantially as specified.

9. The combination of shell A with fire-flue B, return-ues D, and combustionohamber C, having an annular or continuous Water-space surrounding it between it and said shell A,and having its bottom Wall or sheet inclined upward toward its rear end, substantially as spec-ined.

10. The combination, with the inain or tire flue of a boiler and a grate therein, of the straw-feed chute K, having inclined inner end, k, and door k', hinged thereto atits upper side, the inner end of said feed-chute project- MEINRAD RUMELY. WILLIAM N. RUMELY.

Witnesses:

JOHN HANNA, THOMAS MACKEY. 

